Tina Liao 發問時間： 社會與文化語言 · 5 年前

# 產業經濟學作業

1. Tyco International controlled the plastic clothes hanger market in the 1990s.

Suppose that the inverse demand for hangers is given by: P Q = −3 16000.

Suppose further that the marginal cost of producing hangers is constant at \$1.

a. What is the equilibrium price and quantity of hangers if the market is

competitive?

b. What is the equilibrium price and quantity of hangers if the market is

monopolized?

c. What is the deadweight or welfare loss of monopoly in this market?

### 1 個解答

• 5 年前
最佳解答

1.完競市場以P=MC決定產量

P=3-Q/16000=1

2=Q/16000

因此可得到均衡數量與均衡價格

Q=32000

P=1

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2.獨佔市場以MR=MC決定產量

MR的斜率為需求曲線的兩倍

可推得MR=3-2Q/16000

令MR=MC

3-2Q/16000=1

2Q=32000

因此可得到均衡數量

Q=16000

將均衡數量帶回需求函數可得均衡價格

P=2

------------------------------------分隔線------------------------------------

3.求獨佔之下MR=MC產生之無謂損失，要畫圖解題比較易懂

完競社福(社福最大的競價法)-獨佔社福=無謂損失

完競社福=PS+CS

CS=(3-1)x32000/2=32000

PS=(1-1)x32000=0

完競社福=32000

獨佔社福=PS+CS

CS=(3-2)x16000/2=8000

PS=(2-1)x16000=16000

獨佔社福=24000

採獨佔廠商的訂價造成無謂損失=32000-24000=8000

參考資料： 曾經學過
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